: I'm putting a Toester heater in my bathroom and am experiencing a bit of confusion as to where to put the Monoflow tee. On average, about 50 percent advise to put it on the return side, the rest say to put it on the supply side. My current inclination is to put it on the return side and hope that the venturi effect will pull the water through the heater.. What do you think??

one of my houses has two for each radiator: one on the supply and one on the return, of a continuous loop from the hot water boiler.

the monoflows are in the basement. the radiators are on the first floor.